Venus' high surface temperature is due to the ________ effect
Fill in the blank(s) with correct word
greenhouse
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An initially uncharged parallel plate capacitor of capacitance C is charged to potential V by a battery. The battery is then disconnected. Which statement is correct?
A. There is no charge on either plate of the capacitor. B. The capacitor can be discharged by grounding any one of its two plates. C. Charge is distributed evenly over both the inner and outer surfaces of the plates. D. The magnitude of the electric field outside the space between the plates is approximately zero. E. The capacitance increases when the distance between the plates increases.
If the atmosphere’s “optical thickness” n depended on the ratio of the concentrations to the first power instead of to the 1/2 power in equation T10.8a, would this accelerate or brake the warming compared to the model in the text?
A. Accelerate B. Brake C. No change
Wire A and Wire B are each carrying the same current. If the diameter of Wire A is half that of Wire B, how does the drift velocity vdA in Wire A compare to that in Wire B?
a. vdA = 4 vdB c. vdA = vdB /2 b. vdA = 2 vdB d. vdA = vdB /4
Star A is located at the top left of the H-R diagram and has the same luminosity as Star B which is located at the top right of the H-R diagram. How must these stars differ?
A. Star A is hotter and smaller than Star B. B. Star A is cooler and bigger than Star B. C. Star A is hotter and bigger than Star B. D. Star A is cooler and smaller than Star B.